Table 2.

Device characteristics of the vacuum-deposited OLEDs based on the TADF compounds doped in DPEPO

Compound	Conc. (wt%)	Vona (V)	Lmaxb (cd m−2)	λmaxc (nm)	CIEd (x, y)	EQEmax/100/1000e (%)	Δroll-offf (%)	CEg (cd A−1)	PEh (lm W−1)
DPA-BO	5	4.4	106	443	0.15, 0.08	11.6/1.3/-	88	5.3	3.7
	10	3.7	282	449	0.15, 0.09	13.4/4.1/-	70	8.0	5.9
	15	3.5	629	453	0.14, 0.11	16.5/6.2/-	54	12.4	11.1
	20	3.3	1361	454	0.14, 0.12	17.1/7.0/1.7	60	14.6	13.5
d-DPA-BO	5	4.1	138	439	0.16, 0.08	13.1/1.9/-	85	7.3	5.5
	10	3.6	342	446	0.15, 0.09	15.5/3.7/-	74	11.1	9.8
	15	3.3	890	450	0.15, 0.10	15.1/5.6/-	63	13.6	12.7
	20	3.2	1511	454	0.14, 0.11	14.6/6.1/2.1	59	14.0	13.7
DPA-d-BO	5	3.9	153	443	0.15, 0.08	12.4/3.2/-	76	4.2	2.8
	10	3.4	451	449	0.14, 0.09	14.1/5.9/-	60	6.8	5.0
	15	3.2	1111	450	0.14, 0.10	15.6/7.8/2.4	50	9.3	8.2
	20	3.2	1672	453	0.14, 0.11	14.8/8.6/3.5	42	9.4	7.6
d-DPA-d-BO	5	4.0	156	443	0.16, 0.07	13.5/2.1/-	85	7.2	5.4
	10	3.6	456	446	0.15, 0.09	15.4/4.3/-	77	11.3	9.9
	15	3.3	895	450	0.15, 0.10	16.3/6.0/-	64	14.8	13.8
	20	3.2	1758	454	0.15, 0.11	12.6/6.5/2.3	49	12.6	12.1

^aV_on represents turn-on voltage.

^bL_max represents maximum luminance.

^cλ_max represents peak maximum.

^dCIE coordinates are taken at luminance of 100 cd m⁻².

^eEQE_max represents maximum external quantum efficiency.

^fEfficiency roll-off measured by ∆_roll-off = 1 − (EQE₁₀₀/EQE_max).

^gCE represents maximum current efficiency.

^hPE represents maximum power efficiency.